Transcriptome Analysis of Persian Oak (Quercus brantii L.) Decline Using RNA-seq Technology

Area of Science:

• Forestry
• Plant Pathology
• Molecular Biology

Background:

• Oak decline has significantly impacted Zagros oak forests in western Iran since the late 1980s.
• Persian oak (Quercus brantii L.) is a crucial species severely affected by this decline.

Purpose of the Study:

• To identify key genes and molecular mechanisms underlying Persian oak decline using RNA sequencing.
• To understand the genetic basis of oak decline in response to biotic and abiotic stresses.

Main Methods:

• RNA sequencing (Illumina HiSeq 2500) of healthy and declined Persian oak leaves.
• De novo transcriptome assembly to identify unigenes and differentially expressed genes (DEGs).
• Gene ontology analysis to categorize DEG functions.

Main Results:

• Identified 56,743 unigenes and 6049 DEGs between healthy and declined samples.
• Most DEGs were associated with stress-responsive pathways.
• Observed reduced expression in "photosynthesis and storage of sugar" and "protein synthesis" pathways.
• Found up-regulated DEGs in starch degradation and down-regulated DEGs in lignin biosynthesis pathways.

Conclusions:

• This study provides novel insights into the molecular mechanisms of Persian oak decline.
• Findings highlight the role of stress-response genes and altered metabolic pathways in oak decline.
• Identified key genes and pathways crucial for understanding and potentially mitigating oak decline.